Multi-channel liquid sample injection valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a multi-channel liquid sample injection valve which comprises a valve head, a valve body and a rotating shaft, a fixed valve element is fixedly installed at the lower end of the valve head, the rotating shaft penetrates through the valve body through a bearing in a rotating mode, and a movable valve element is fixedly installed at the upper end of the rotating shaft. The valve head and the fixed valve element are correspondingly provided with a plurality of first channels and a plurality of second channels which penetrate through the upper surface and the lower surface respectively, a third channel is arranged between every two adjacent second channels, and a first communicating groove is formed in the upper end of each third channel and communicates with the corresponding adjacent second channel. A fourth channel penetrating through the upper surface and the lower surface is formed in the movable valve element, the upper end of the fourth channel selectively communicates with one of the second channels, two second communicating grooves are formed in the upper surface of the movable valve element, and each second communicating groove can communicate the lower ends of the two adjacent second channels; the upper end of the sample feeding pipe is communicated with the lower end of the fourth channel; the lower end of the rotating shaft extends out of the valve body and is fixedly connected with a handle.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a multi-channel liquid injection valve. Background Technology

[0002] The injection valve is mainly used in chromatographic systems to controllably introduce samples into the system. It is a key component of analytical instruments for liquid sample introduction, primarily used in chromatographic analysis to deliver samples into a high-pressure liquid mobile phase, to rinse different components, or to switch between multiple separation systems.

[0003] Currently, injection valves are classified into two types based on their driving method: manual and electric. For example, Chinese invention patent application number CN202211315713.8 discloses a multi-channel injection valve, which is electrically driven. Although motor-driven rotation is faster, the structure is more complex, and its use or location is easily restricted. Therefore, there is an urgent need to provide a multi-channel liquid injection valve with a simple structure, more flexible use, more adjustable flow channels, and manual adjustment capability. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a multi-channel liquid injection valve that is reasonably designed, simple in structure, flexible in use, has more adjustable flow channels, and can be manually adjusted.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-channel liquid injection valve includes a valve head, a valve body, and a rotating shaft. The valve head is fixedly installed at the top of the valve body, and a fixed valve core is fixedly installed at the lower end of the valve head. The rotating shaft is rotatably inserted through the valve body via a bearing, and a movable valve core is fixedly installed at the upper end of the rotating shaft. The upper surface of the movable valve core and the lower surface of the fixed valve core are in contact with each other. The valve head and the fixed valve core are respectively provided with multiple first channels and multiple second channels that penetrate the upper and lower surfaces. A third channel is provided between two adjacent second channels. The upper end of the third channel is provided with a first connecting groove that connects to an adjacent second channel. The movable valve core is provided with a fourth channel that penetrates the upper and lower surfaces. The upper end of the fourth channel can selectively connect to one of the second channels. Two second connecting grooves are provided on the upper surface of the movable valve core. Each second connecting groove can connect the lower ends of two adjacent second channels. An axially extending injection tube is inserted inside the rotating shaft. The upper end of the injection tube connects to the lower end of the fourth channel. The lower end of the rotating shaft extends out of the valve body and is fixedly connected to a handle.

[0007] Furthermore, it also includes an intermediate cylinder, wherein the valve head, the intermediate cylinder and the valve body are connected and fixed together as a whole from top to bottom by a plurality of first connecting screws.

[0008] Furthermore, it also includes a rotation limiting assembly, which includes a limiting groove and a limiting rod. The limiting groove is opened on the inner wall of the intermediate cylinder in a circumferential direction, and one end of the limiting rod is fixedly connected to the upper outer wall of the rotating shaft, while the other end of the limiting rod extends into the limiting groove.

[0009] Furthermore, it also includes a rotation positioning sensing component, which includes a magnet and a magnetic induction switch. The magnetic induction switch is embedded inside the intermediate cylinder, and the magnet is embedded on the peripheral outer wall of the moving valve core, corresponding to the magnetic induction switch.

[0010] Preferably, the fixed valve core is fixedly installed at the lower end of the valve head by a plurality of first pins, the valve head and the intermediate cylinder are positioned and connected by a second pin, and the intermediate cylinder and the valve body are positioned and connected by a third pin.

[0011] Preferably, the lower end of the rotating shaft is coaxially connected to a knob via a second connecting screw, and the handle is fixedly connected to the outer wall of the knob via a third connecting screw.

[0012] Preferably, a disc spring washer is fitted on the outer side of the rotating shaft, and the disc spring washer is located above the bearing.

[0013] Preferably, a bushing is fitted on the outer side of the rotating shaft, and the bushing is located below the bearing and between the lower end of the valve body and the rotating shaft.

[0014] Preferably, the rotating shaft is T-shaped, and a guide sleeve is fitted on the upper end of the rotating shaft, with the upper end of the guide sleeve extending to the outside of the moving valve core.

[0015] Preferably, an injection pad is provided between the upper end of the injection tube and the lower end of the fourth channel, and an injection connector is provided at the lower end of the injection tube.

[0016] This utility model adopts the above technical solution and has the following technical effects:

[0017] This invention features a handle that allows for easy manual control of the rotating shaft, enabling the moving valve core to rotate relative to the fixed valve core. The structure is simpler and more flexible, making it particularly suitable for applications requiring manual operation. In use, the solution to be tested is injected through the bottom inlet using a syringe needle. The solution flows sequentially through the injection tube, the fourth channel, the second channel, and the first channel. During this process, the handle can be manually rotated to drive the rotating shaft and the moving valve core in a circumferential rotation. This selectively connects the upper end of the fourth channel to one of the second channels, switching the solution outflow through the first channel. This allows for precise solution transfer by selectively switching the flow path. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings are described as follows:

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention from one perspective;

[0020] Figure 2 This is a three-dimensional structural diagram of the present invention from another perspective;

[0021] Figure 3 This is an exploded view of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of this utility model along a longitudinal section;

[0023] Figure 5 This is a schematic diagram of the structure of this utility model along another longitudinal section;

[0024] Figure 6 This is a three-dimensional structural diagram of the fixed valve core and the moving valve core of this utility model;

[0025] Figure 7 This is a schematic diagram of the fit between the fixed valve core and the moving valve core of this utility model;

[0026] Figure 8 This is a schematic diagram showing the handle position in two working modes of this utility model.

[0027] Figure 9 This is a schematic diagram illustrating the working state mode of this utility model;

[0028] Figure 10 This is a schematic diagram illustrating the principle of another working mode of this utility model;

[0029] In the picture:

[0030] 10. Valve head; 11. First channel; 20. Valve body; 30. Rotating shaft; 31. Injection tube; 40. Fixed valve core; 41. Second channel; 42. Third channel; 43. First connecting groove; 50. Moving valve core; 51. Fourth channel; 52. Second connecting groove; 61. Bearing; 62. Handle; 63. Intermediate cylinder; 64. Knob; 65. Disc spring washer; 66. Bushing; 67. Guide sleeve; 68. Injection gasket; 69. Injection connector; 71. First connecting screw; 72. First pin; 73. Second pin; 74. Third pin; 75. Second connecting screw; 76. Third connecting screw; 80. Rotation limit assembly; 81. Limit groove; 82. Limit rod; 90. Rotation position sensing assembly; 91. Magnet; 92. Magnetic induction switch. Detailed Implementation

[0031] The embodiments described below are merely some embodiments of the present invention and do not represent all embodiments consistent with the present invention. Exemplary embodiments will now be described with reference to the accompanying drawings:

[0032] See Figure 1-10 As shown in the figure, the multi-channel liquid injection valve of this utility model includes a valve head 10, a valve body 20, and a rotating shaft 30. The valve head 10 is fixedly installed on the top of the valve body 20, and a fixed valve core 40 is fixedly installed on the lower end of the valve head 10. The rotating shaft 30 is rotatably inserted into the valve body 20 through a bearing 61. A movable valve core 50 is fixedly installed on the upper end of the rotating shaft 30. The upper surface of the movable valve core 50 and the lower surface of the fixed valve core 40 are in contact with each other and can rotate relative to each other. Thus, by controlling the rotation of the rotating shaft 30, the movable valve core 50 can be driven to rotate in contact with the fixed valve core 40, so that the movable valve core 50 and the fixed valve core 40 are tightly connected and leak-proof. The valve head 10 and the fixed valve core 40 are respectively provided with a plurality of first channels 11 and a plurality of second channels 11 that penetrate the upper and lower surfaces. Two channels 41, one of which is a third channel 42 between two adjacent second channels 41. The upper end of the third channel 42 is provided with a first connecting groove 43 that connects to an adjacent second channel 41. The moving valve core 50 is provided with a fourth channel 51 that runs through the upper and lower surfaces. The upper end of the fourth channel 51 can selectively connect to one of the second channels 41. The upper surface of the moving valve core 50 is provided with two second connecting grooves 52. Each second connecting groove 52 can connect the lower ends of two adjacent second channels 41. The rotating shaft 30 is provided with an axially extending sample inlet tube 31. The upper end of the sample inlet tube 31 connects to the lower end of the fourth channel 51. The lower end of the rotating shaft 30 extends out of the valve body 20 and is fixedly connected to a handle 62.

[0033] In this embodiment, the handle 62 allows for easy manual control of the rotating shaft 30 to rotate, thereby driving the moving valve core 50 to rotate relative to the fixed valve core 40. The structure is simpler and the use is more flexible, making it particularly suitable for applications where manual operation is the only option.

[0034] To facilitate partial replacement or maintenance of components, based on the above structure, this utility model further includes an intermediate cylinder 63. The valve head 10, the intermediate cylinder 63, and the valve body 20 are connected and fixed as a whole from top to bottom by a plurality of first connecting screws 71.

[0035] In order to better limit the rotation angle range of the moving valve core 50 relative to the fixed valve core 40, based on the above structure, the present invention further includes a rotation limiting component 80. The rotation limiting component 80 includes a limiting groove 81 and a limiting rod 82. The limiting groove 81 is opened on the inner wall of the intermediate cylinder 63 in a circumferential direction. One end of the limiting rod 82 is fixedly connected to the upper outer wall of the rotating shaft 30, and the other end of the limiting rod 82 extends into the limiting groove 81.

[0036] To more conveniently send the signal of whether the moving valve core 50 has rotated into position relative to the stationary valve core 40 to the test personnel or related equipment, based on the above structure, this utility model further includes a rotation position sensing component 90. The rotation position sensing component 90 includes a magnet 91 and a magnetic induction switch 92. The magnetic induction switch 92 is embedded in the interior of the intermediate cylinder 63, and the magnet 91 is embedded in the peripheral outer wall of the moving valve core 50 corresponding to the magnetic induction switch 92.

[0037] In this embodiment, the rotation positioning sensing component 90 is configured such that when the moving valve core 50 drives the magnet 91 to rotate and approach the position of the magnetic induction switch 92, the magnetic induction switch 92 is turned on and sends a positioning signal to the test personnel or related equipment.

[0038] As a preferred embodiment, based on the above structure, preferably, the fixed valve core 40 is fixedly installed at the lower end of the valve head 10 by a plurality of first pins 72, the valve head 10 and the intermediate cylinder 63 are positioned and connected by second pins 73, and the intermediate cylinder 63 and the valve body 20 are positioned and connected by third pins 74.

[0039] As a preferred embodiment, based on the above structure, preferably, the lower end of the rotating shaft 30 is coaxially connected to the knob 64 via the second connecting screw 75, and the handle 62 is fixedly connected to the outer wall of the knob 64 via the third connecting screw 76.

[0040] As a preferred embodiment, based on the above structure, preferably, a disc spring washer 65 is sleeved on the outer side of the rotating shaft 30, and the disc spring washer 65 is disposed above the bearing 61.

[0041] In this embodiment, the disc spring washer 65 is designed to store a certain amount of kinetic potential energy by leveraging the force during the rotation of the rotating shaft 30. During the slow relaxation process, some of the kinetic potential energy will be converted into the power connecting the moving valve core 50 and the fixed valve core 40, thus achieving the effect of sealing the spring. This allows the moving valve core 50 to rotate against the lower surface of the fixed valve core 40, ensuring a tight and leak-proof connection between the two.

[0042] As a preferred embodiment, based on the above structure, preferably, a bushing 66 is sleeved on the outer side of the rotating shaft 30, and the bushing 66 is located below the bearing 61 and between the lower end of the valve body 20 and the rotating shaft 30.

[0043] As a preferred embodiment, based on the above structure, preferably, the rotating shaft 30 is T-shaped, and a guide sleeve 67 is sleeved on the upper end of the rotating shaft 30, with the upper end of the guide sleeve 67 extending to the outside of the moving valve core 50.

[0044] As a preferred embodiment, based on the above structure, preferably, an injection pad 68 is provided between the upper end of the injection tube 31 and the lower end of the fourth channel 51, and an injection connector 69 is provided at the lower end of the injection tube 31.

[0045] In this embodiment, it is made easy to inject the solution to be tested through the injection needle from the bottom injection port of the injection connector 69 at the lower end of the injection tube 31, and the injection gasket 68 is used to further improve the conductivity and sealing during the liquid delivery process to avoid leakage.

[0046] As a preferred embodiment, based on the above structure, preferably, the number of the first channel 11 and the second channel 41 are both 6, and they are respectively connected one-to-one and labeled as channel 1, channel 2, channel 3, channel 4, channel 5 and channel 6.

[0047] The working principle of this utility model is as follows:

[0048] like Figure 8 As shown in the figure, as one embodiment, this utility model has two working modes: one is the loading mode when the handle is in state A as shown by the solid line in the figure, and the other is the injection mode when the handle is in state B as shown by the dashed line in the figure; in use, the two ends of the metering ring are connected to channel 1 and channel 4 respectively, and the high-pressure liquid of the testing equipment and the high-pressure pump are connected to channel 3 and channel 2 respectively.

[0049] like Figure 9 As shown, when the handle is rotated to the loading mode in state A, the upper end of the fourth channel 51 can connect to channel 4, and one of its second connecting grooves 52 connects channel 1 and channel 6, and the other second connecting groove 52 connects channel 2 and channel 3. The high-pressure liquid from the high-pressure pump is connected to the testing equipment through channels 2 and 3; therefore, the injection needle is used to... Figure 4 The test solution is injected into the injection port at the bottom of the injection connector 69. After the test solution flows out through the injection tube 31, the fourth channel 51 and the channel 4, it enters the inside of the quantitative loop. When the quantitative loop is full of the test solution, the handle can be rotated to state B.

[0050] like Figure 10 As shown, when the handle is rotated to the injection mode in state B, the upper end of the fourth channel 51 can be connected to channel 5, and one of its second connecting grooves 52 connects channel 1 and channel 2, and the other second connecting groove 52 connects channel 3 and channel 4; therefore, the high-pressure liquid from the high-pressure pump can be connected from channel 2 to the first channel 1, and then connected to the metering ring. Under the action of high pressure, the test solution inside the metering ring is injected into the first channel 4, and flows out through channel 3 and enters the testing equipment to test the solution composition.

[0051] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any equivalent changes, modifications, substitutions, and variations made by those skilled in the art based on the concept of this utility model and on the basis of existing technology through logical analysis, reasoning, or limited experiments shall be within the scope of protection defined by the claims.

Claims

1. A multi-channel liquid injection valve, comprising a valve head (10), a valve body (20), and a rotating shaft (30), wherein the valve head (10) is fixedly installed at the top of the valve body (20), a fixed valve core (40) is fixedly installed at the lower end of the valve head (10), the rotating shaft (30) is rotatably inserted through the valve body (20) via a bearing (61), a movable valve core (50) is fixedly installed at the upper end of the rotating shaft (30), and the upper surface of the movable valve core (50) and the lower surface of the fixed valve core (40) are in contact with each other, characterized in that: The valve head (10) and the fixed valve core (40) are respectively provided with a plurality of first channels (11) and a plurality of second channels (41) that penetrate the upper and lower surfaces. A third channel (42) is provided between two adjacent second channels (41). The upper end of the third channel (42) is provided with a first connecting groove (43) that connects to an adjacent second channel (41). The moving valve core (50) is provided with a fourth channel (51) that penetrates the upper and lower surfaces. The upper end of the fourth channel (51) can selectively connect to one of the second channels (41). The upper surface of the moving valve core (50) is provided with two second connecting grooves (52). Each second connecting groove (52) can connect the lower ends of two adjacent second channels (41). The inside of the rotating shaft (30) is provided with an axially extending injection tube (31). The upper end of the injection tube (31) is connected to the lower end of the fourth channel (51). The lower end of the rotating shaft (30) extends out of the valve body (20) and is fixedly connected with a handle (62).

2. The multi-channel liquid injection valve according to claim 1, characterized in that: It also includes an intermediate cylinder (63), wherein the valve head (10), the intermediate cylinder (63) and the valve body (20) are connected and fixed together from top to bottom by a plurality of first connecting screws (71).

3. The multi-channel liquid injection valve according to claim 2, characterized in that: It also includes a rotation limiting assembly (80), which includes a limiting groove (81) and a limiting rod (82). The limiting groove (81) extends circumferentially and is opened on the inner wall of the intermediate cylinder (63). One end of the limiting rod (82) is fixedly connected to the upper outer wall of the rotating shaft (30), and the other end of the limiting rod (82) extends into the limiting groove (81).

4. The multi-channel liquid injection valve according to claim 2, characterized in that: It also includes a rotation positioning sensing component (90), which includes a magnet (91) and a magnetic induction switch (92). The magnetic induction switch (92) is embedded in the interior of the intermediate cylinder (63), and the magnet (91) is embedded in the outer wall of the moving valve core (50) corresponding to the magnetic induction switch (92).

5. The multi-channel liquid injection valve according to claim 2, characterized in that: The fixed valve core (40) is fixedly installed at the lower end of the valve head (10) by a plurality of first pins (72). The valve head (10) and the intermediate cylinder (63) are positioned and connected by a second pin (73). The intermediate cylinder (63) and the valve body (20) are positioned and connected by a third pin (74).

6. The multi-channel liquid injection valve according to claim 1, characterized in that: The lower end of the rotating shaft (30) is coaxially connected to a knob (64) via a second connecting screw (75), and the handle (62) is fixedly connected to the outer wall of the knob (64) via a third connecting screw (76).

7. The multi-channel liquid injection valve according to claim 1, characterized in that: A disc spring washer (65) is sleeved on the outside of the rotating shaft (30), and the disc spring washer (65) is located above the bearing (61).

8. The multi-channel liquid injection valve according to claim 1, characterized in that: A bushing (66) is fitted on the outer side of the rotating shaft (30). The bushing (66) is located below the bearing (61) and between the lower end of the valve body (20) and the rotating shaft (30).

9. The multi-channel liquid injection valve according to claim 1, characterized in that: The rotating shaft (30) is T-shaped, and a guide sleeve (67) is fitted on the upper end of the rotating shaft (30). The upper end of the guide sleeve (67) extends to the outside of the moving valve core (50).

10. The multi-channel liquid injection valve according to claim 1, characterized in that: An injection pad (68) is provided between the upper end of the injection tube (31) and the lower end of the fourth channel (51), and an injection connector (69) is provided at the lower end of the injection tube (31).

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